In jQuery, you design a page, and then you make it dynamic. This is because jQuery was designed for augmentation and has grown incredibly from that simple premise.

But in AngularJS, you must start from the ground up with your architecture in mind. Instead of starting by thinking "I have this piece of the DOM and I want to make it do X", you have to start with what you want to accomplish, then go about designing your application, and then finally go about designing your view.

2. Don't augment jQuery with AngularJS

Similarly, don't start with the idea that jQuery does X, Y, and Z, so I'll just add AngularJS on top of that for models and controllers. This isreallytempting when you're just starting out, which is why I always recommend that new AngularJS developers don't use jQuery at all, at least until they get used to doing things the "Angular Way".

I've seen many developers here and on the mailing list create these elaborate solutions with jQuery plugins of 150 or 200 lines of code that they then glue into AngularJS with a collection of callbacks and$applys that are confusing and convoluted; but they eventually get it working! The problem is that inmostcases that jQuery plugin could be rewritten in AngularJS in a fraction of the code, where suddenly everything becomes comprehensible and straightforward.

The bottom line is this: when solutioning, first "think in AngularJS"; if you can't think of a solution, ask the community; if after all of that there is no easy solution,thenfeel free to reach for the jQuery. But don't let jQuery become a crutch or you'll never master AngularJS.

3. Always think in terms of architecture

First know thatsingle-page applicationsareapplications. They'renotwebpages. So we need to think like a server-side developerin additionto thinking like a client-side developer. We have to think about how to divide our application into individual, extensible, testable components.

So thenhowdo you do that? How do you "think in AngularJS"? Here are some general principles, contrasted with jQuery.

The view is the "official record"

In jQuery, we programmatically change the view. We could have a dropdown menu defined as aullike so:

In jQuery, in our application logic, we would activate it with something like:

$('.main-menu').dropdownMenu();

When we just look at the view, it's not immediately obvious that there is any functionality here. For small applications, that's fine. But for non-trivial applications, things quickly get confusing and hard to maintain.

In AngularJS, though, the view is the official record of view-based functionality. Ouruldeclaration would look like this instead:

<ulclass="main-menu"dropdown-menu>
...
</ul>

These two do the same thing, but in the AngularJS version anyone looking at the template knows what's supposed to happen. Whenever a new member of the development team comes on board, she can look at this and thenknowthat there is a directive calleddropdownMenuoperating on it; she doesn't need to intuit the right answer or sift through any code. The view told us what was supposed to happen. Much cleaner.

Developers new to AngularJS often ask a question like: how do I find all links of a specific kind and add a directive onto them. The developer is always flabbergasted when we reply: you don't. But the reason you don't do that is that this is like half-jQuery, half-AngularJS, and no good. The problem here is that the developer is trying to "do jQuery" in the context of AngularJS. That's never going to work well. The viewisthe official record. Outside of a directive (more on this below), you never, ever,neverchange the DOM. And directives are appliedin the view, so intent is clear.

Remember: don't design, and then mark up. You must architect, and then design.

Data binding

This is by far one of the most awesome features of AngularJS and cuts out a lot of the need to do the kinds of DOM manipulations I mentioned in the previous section. AngularJS will automatically update your view so you don't have to! In jQuery, we respond to events and then update content. Something like:

Apart from mixing concerns, we also have the same problems of signifying intent that I mentioned before. But more importantly, we had to manually reference and update a DOM node. And if we want to delete a log entry, we have to code against the DOM for that too. How do we test the logic apart from the DOM? And what if we want to change the presentation?

This a little messy and a trifle frail. But in AngularJS, we can do this:

And now instead of using an unordered list, we're using Bootstrap alert boxes. And we never had to change the controller code! But more importantly, no matterwhereorhowthe log gets updated, the view will change too. Automatically. Neat!

Though I didn't show it here, the data binding is two-way. So those log messages could also be editable in the view just by doing this:<input ng-model="entry.msg" />. And there was much rejoicing.

Distinct model layer

In jQuery, the DOM is kind of like the model. But in AngularJS, we have a separate model layer that we can manage in any way we want, completely independently from the view. This helps for the above data binding, maintainsseparation of concerns, and introduces far greater testability. Other answers mentioned this point, so I'll just leave it at that.

Separation of concerns

And all of the above tie into this over-arching theme: keep your concerns separate. Your view acts as the official record of what is supposed to happen (for the most part); your model represents your data; you have a service layer to perform reusable tasks; you do DOM manipulation and augment your view with directives; and you glue it all together with controllers. This was also mentioned in other answers, and the only thing I would add pertains to testability, which I discuss in another section below.

Dependency injection

To help us out with separation of concerns isdependency injection(DI). If you come from a server-side language (fromJavatoPHP) you're probably familiar with this concept already, but if you're a client-side guy coming from jQuery, this concept can seem anything from silly to superfluous to hipster. But it's not. :-)

From a broad perspective, DI means that you can declare components very freely and then from any other component, just ask for an instance of it and it will be granted. You don't have to know about loading order, or file locations, or anything like that. The power may not immediately be visible, but I'll provide just one (common) example: testing.

Let's say in our application, we require a service that implements server-side storage through aRESTAPI and, depending on application state, local storage as well. When running tests on our controllers, we don't want to have to communicate with the server - we're testing thecontroller, after all. We can just add a mock service of the same name as our original component, and the injector will ensure that our controller gets the fake one automatically - our controller doesn't and needn't know the difference.

Speaking of testing...

4. Test-driven development -always

This is really part of section 3 on architecture, but it's so important that I'm putting it as its own top-level section.

Out of all of the many jQuery plugins you've seen, used, or written, how many of them had an accompanying test suite? Not very many because jQuery isn't very amenable to that. But AngularJS is.

In jQuery, the only way to test is often to create the component independently with a sample/demo page against which our tests can perform DOM manipulation. So then we have to develop a component separately andthenintegrate it into our application. How inconvenient! So much of the time, when developing with jQuery, we opt for iterative instead of test-driven development. And who could blame us?

But because we have separation of concerns, we can do test-driven development iteratively in AngularJS! For example, let's say we want a super-simple directive to indicate in our menu what our current route is. We can declare what we want in the view of our application:

<ahref="/hello"when-active>Hello</a>

Okay, now we can write a test for the non-existentwhen-activedirective:

5. Conceptually, directives arenotpackaged jQuery

You'll often hear "only do DOM manipulation in a directive".This is a necessity.Treat it with due deference!

But let's dive a little deeper...

Some directives just decorate what's already in the view (thinkngClass) and therefore sometimes do DOM manipulation straight away and then are basically done. But if a directive is like a "widget" and has a template, it shouldalsorespect separation of concerns. That is, the templatetooshould remain largely independent from its implementation in the link and controller functions.

AngularJS comes with an entire set of tools to make this very easy; withngClasswe can dynamically update the class;ngModelallows two-way data binding;ngShowandngHideprogrammatically show or hide an element; and many more - including the ones we write ourselves. In other words, we can do all kinds of awesomenesswithoutDOM manipulation. The less DOM manipulation, the easier directives are to test, the easier they are to style, the easier they are to change in the future, and the more re-usable and distributable they are.

I see lots of developers new to AngularJS using directives as the place to throw a bunch of jQuery. In other words, they think "since I can't do DOM manipulation in the controller, I'll take that code put it in a directive". While that certainly is much better, it's oftenstill wrong.

Think of the logger we programmed in section 3. Even if we put that in a directive, westillwant to do it the "Angular Way". Itstilldoesn't take any DOM manipulation! There are lots of times when DOM manipulation is necessary, but it's alotrarer than you think! Before doing DOM manipulationanywherein your application, ask yourself if you really need to. There might be a better way.

Here's a quick example that shows the pattern I see most frequently. We want a toggleable button. (Note: this example is a little contrived and a skosh verbose to represent more complicated cases that are solved in exactly the same way.)

First, jQuery was never necessary. There's nothing we did here that needed jQuery at all!

Second, even if we already have jQuery on our page, there's no reason to use it here; we can simply useangular.elementand our component will still work when dropped into a project that doesn't have jQuery.

Third, even assuming jQuerywasrequired for this directive to work, jqLite (angular.element) willalwaysuse jQuery if it was loaded! So we needn't use the$- we can just useangular.element.

Fourth, closely related to the third, is that jqLite elements needn't be wrapped in$- theelementthat is passed to thelinkfunction wouldalready bea jQuery element!

And fifth, which we've mentioned in previous sections, why are we mixing template stuff into our logic?

This directive can be rewritten (even for very complicated cases!) much more simply like so:

Again, the template stuff is in the template, so you (or your users) can easily swap it out for one that meets any style necessary, and thelogicnever had to be touched. Reusability - boom!

And there are still all those other benefits, like testing - it's easy! No matter what's in the template, the directive's internal API is never touched, so refactoring is easy. You can change the template as much as you want without touching the directive. And no matter what you change, your tests still pass.

w00t!

So if directives aren't just collections of jQuery-like functions, what are they? Directives are actuallyextensions of HTML. If HTML doesn't do something you need it to do, you write a directive to do it for you, and then use it just as if it was part of HTML.

Put another way, if AngularJS doesn't do something out of the box, think how the team would accomplish it to fit right in withngClick,ngClass, et al.

Summary

Don't even use jQuery. Don't even include it. It will hold you back. And when you come to a problem that you think you know how to solve in jQuery already, before you reach for the$, try to think about how to do it within the confines the AngularJS. If you don't know, ask! 19 times out of 20, the best way to do it doesn't need jQuery and to try to solve it with jQuery results in more work for you.